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If it's pic card installed on motherboard then reconnect it into it's slot.Then uninstall driver from device manager and control panel->add remove programs then reinstall driver then check.Also check in bios that ehterrnet lan is enabled on bios.When you power up the computer press F1 or F2 or del or ALT+F2 key to enter in bios then go to advanced and enable ethernet lan option then save settings and exit from bios.Let me know if you need further assistance.Thanks for using FixYa.

Hello and Welcome to FixYa!
Make sure, that the ethernet driver is properly installed and is Working. Moreover, do make sure, that the ethernet (LAN) is enabled, from the Control Panel Network Connections. Secondly, double check that the LAN is not disabled from the BIOS settings (Settings at the start up menu, before the OS boots).

The on board lan could have went bad. You can try disabling it in the bios and reboot, then look in device manager and at the top check "show hidden devices" and un-install the network card and the controller. Then reboot to the bios and enable it again and when you reboot windows should say that it has found new hardware and let windows try to install the drivers. I have had that happen on a lot of computers lately. If it still does not work, I would install a separate network card in an empty slot.Hope I was of some help ,Thanks for using Fixya

Then on left side Search for Yellow question mark on Ethernet controller if it occurs than the problem is that you have to reinstall your LAN drivers which can be Downloaded hereAnd If there is no Yellow Question Mark then you have to bring a LAN card and insert in PCI Express Slot.

first check for all the drivers in the device manager....
if every thing is perfect in driver side, then check if the ethernet/ lan is enabled....
then check is the light in the ethernet adapter is lit, when you plug any ethenet cable in it...
still if it is not working, then finally try to update the latest driver for the ethernet controller....
if nothing works, then buy an pci ethernet card and use it.....
you can also buy external cards like usb to ethernet converter...
even belkin manufactures usb to ethernet controller....

your operating system should detect and install the drivers for your network controller if it is an internal on board LAN. however you must be sure that you have the LAN enabled in your BIOS setup under the advanced selection on the bios screen. otherwise , your operating system won't even see that you have a LAN connection.

Most modern ATX motherboards should have a 3-pin Wake-on-LAN connector
near the PCI slots and should included BIOS support for Wake-on-LAN
power up,check the Power Management
Setup for this option.As i check in your motherboard manual there is not pin but it supports wake on lan so go to bios and enable power on ring in power managment,it should be enable by default.Next right click on your computer,then properties,then device manager(OR YOU CAN SIMPLY GO TO START->RUN AND TYPE devmgmt.msc and hit enter).Then find the network adapters,click on it,and click on your ethernet controller(it should be realtek,gigabyte something like that) and the go to advance and scroll(search) for "wake up on lan" "wake up capabilities" and make sure that is on or enabled AND YOUR DONE:)

Hi,please restart your system and at the blue dell logo keep tapping the F2 key, the bios setup screen will open, check in here if the lan card is enabled here or not. if not enable the lan card, once it is enabled from here windows will detect it and prompt you to install drivers.

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